Basic Guidelines For English Spellings
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See US English definition of fierce
See UK English definition of fierce
See Spanish definition of fiero
1‘a fierce black mastiff’
gentle, tame
2‘they are facing fierce competition from American firms’
mild
3‘a fierce, murderous jealousy lanced through Meredith’
mild
4‘a fierce wind coming in off the sea’
gentle
5‘a fierce pain shot between his eyes’
mild